hydrogen h2 molecular orbitals
Simple Molecular Orbitals - Sigma and Pi Bonds in Molecules pot
... sigma-star molecular orbitals pictorially and energetically for a hydrogen molecule The bond order calculation equals one, which is what we expect for diatomic hydrogen hydrogen molecule = H2 σ∗ = ... orbital to form two sp hybrid orbitals Remember that when we mix atomic orbitals together, we create the same number of new “mixture” orbitals This is true for molecular orbitals on multiple atoms, ... with two orbitals (2s + 2p), because we are going to it all over again with three orbitals (2s + 2p + 2p = three sp2 hybrid orbitals) and four orbitals (2s + 2p + 2p + 2p = four sp3 hybrid orbitals) ...
Ngày tải lên: 06/03/2014, 08:20
Car Test -- Hydrogen On Demand (Pure hydrogen, not HHO) Can pure hydrogen (H2) replace HHO to increase MPG? pdf
... Contents Car Test Hydrogen On Demand Section Hydrogen Cell Initial Results, 2011 Can pure hydrogen (H2) replace HHO to increase MPG? Technology comparison; HHO system and CC-HOD H2 system ... 33 How to evaluate this new H2 system 34 CT.p65 Page Phillips Company Section -Hydrogen Cell Initial Results, 2011 CT.p65 Page Can pure hydrogen (H2) replace HHO to increase MPG? Phillips ... low-current electrolysis almost all the gas produced will be hydrogen The hydrogen is produced according to 2Al + 6[H2O] + CC = CC + 2[Al(OH)3] + 3 [H2] CT.p65 Page 26 Phillips Company The control system...
Ngày tải lên: 07/03/2014, 11:20
high h2 sensing performance in hydrogen trititanate-derived tio2
... properties of the sensors fabricated from these H2 Ti3 O7 -derived TiO2 powders Experimental 2.1 Preparation and characterization of H2 Ti3 O7 powder Two types of H2 Ti3 O7 powders were prepared by ion ... Korea Fig (A) H2 concentration dependence of the gas response and (B) H2 selectivity against CO in the i-700 sensor Varghese et al [4] suggested the chemisorption of the spilledover hydrogen atoms ... for H2 Thus, the i-700 sensor exhibited an excellent selectivity toward H2 gas in a N2 atmosphere However, the gas response was extremely low in air The magnitude of the gas response to 1.0% H2...
Ngày tải lên: 19/03/2014, 16:48
MOLECULAR AND FUNCTIONAL CHARACTERISATION OF THE ROLE OF HYDROGEN SULPHIDE IN SEXUAL MEDICINE
... 1.3.1 Hydrogen sulphide 1.3.1.1 Overview of H2S 1.3.1.2 Biosynthesis of H2S 1.3.1.3 Metabolism of H2S 11 1.3.1.4 Roles of H2S in erectile ... of H2S on erectile response 74 5.2 Relationship between H2S, NO and erectile function 75 5.3 Effects of H2S on the cGMP and cAMP second messenger system 80 5.4 Effect of H2S ... Figure 1.2 Enzymatic production of H2S 10 Figure 1.3 Non-enzymatic endogenous production of H2S 11 Figure 1.4 H2S metabolism 12 Figure 1.5 H2S as an inhibitor of superoxide...
Ngày tải lên: 12/10/2015, 17:33
Báo cáo y học: "The Diels-Alder-Reaction with inverse-Electron-Demand, a very efficient versatile Click-Reaction Concept for proper Ligation of variable molecular Partners"
... steps were initiated and carried out in i) 1, a) 50% NaOH, b) H2SO4; ii) NaNO2 in glacial acetic acid; iii) SOCl2, MeOH; NaNO2 iv) R-NH2; NaNO2, glacial acetic acid Synthesis of tetrazine diene ... insurmountable obstacles; unfortunately their physico-chemical properties as well as in the big molecular weight result in a barely noticeable diffusibility, insufficient for therapeutic local ... subsequently for the transport into subcellular components like the cell nucleus for imaging of molecular processes at the transcriptional level Therefore rapid and selective ligation of pharmacologically...
Ngày tải lên: 26/10/2012, 09:39
Báo cáo y học: "Molecular Virology of Hepatitis C Virus (HCV): 2006 Update"
... three-dimensional structure of the HCV IRES bound to the 40S ribosomal subunit illustrates the molecular basis of this capindependent translation process [30] High-resolution structural data ... at the NS2/NS3 junction while all downstream sites are processed by the NS3-4A serine protease Molecular aspects of viral proteins 5.1 Structural proteins 5.1.1 Core protein The HCV core protein ... separate the genome from nucleic acid binding proteins Recent advances in the understanding of the molecular mechanisms of this enzyme could enable a specific inhibition as a novel antiviral strategy...
Ngày tải lên: 02/11/2012, 10:00
Báo cáo y học: "Advances in Molecular Diagnosis of HBV Infection and Drug Resistance"
... Assessing hepatitis B virus resistance in vitro and molecular mechanisms of nucleoside resistance Semin Liver Dis 2002;22:23-31 21 Doo E, Liang TJ Molecular anatomy and pathophysiologic implications ... resistance and the impact of such mutations turn out to be clinically relevant for therapy management Molecular Mechanisms of Drug Resistance HBV is a small but elusive DNA virus that presents relatively ... Sci 2005 2(1) 12 (3) Phenotyping Methods These methods detect drug resistance based on the use of molecular or cellular techniques or using animal models [20] Such systems are useful for studying...
Ngày tải lên: 03/11/2012, 09:41
Các phương pháp tổng hợp methanol, H2, O2 và khí tổng hợp
... CH2,2) Áp suất Nhiệt Tỉ lệ (Mpa)M độ(0oC) nước/C 2,07 800 CH2,2 + 3H2O → 0,2CH4 + 3,0 +102,5 0,4CH2 + 0,4CO + 1, 9H2 + 1,8H2O 2,76 750 CH2,2 + 3H2O → 3,35CH4 + 3,0 +75 0,4CH2 + 0,25CO + 1,4 5H2 ... reforming (3), metan hóa (4) chuyển hóa CO (5) C2H2n+2 + nH2O → nCO + (2n+1 )H2 (3) CO + 3H2 ↔ CH4 + H2O ΔH = -206 kJ/mol (4) CO + H2O ↔ CO2 + H2 ΔH = -41 kJ/mol (5) Phản ứng reforming (3) thu ... (CH4) 2CH4+3H2O ↔ 7H2+ CO+CO2 CH4 + ½ O2 ↔ CO + 2H2 Ni/CaAl2O4, Ni/α-Al2O3 CO + H2O → H2 + CO2 Fe3O4 –Cr2O3 CO + H2O → H2 + CO2 CuO CO + 3H2 → CH4 + H2O Chuyển hóa CO nhiệt độ Ni/Al2O3 cao Chuyển...
Ngày tải lên: 20/03/2013, 14:43
QUANG PHỔ -H2
... hồng ngoại Lyman Balmer Paschen Giải thích: a Sự tạo thành vạch: - Ở trạng thái bản: nguyên tử H2 có mức lượng thấp (e) quỹ đạo K - Khi bị kích thích : nguyên tử nhận lượng ( e) chuyển lên quỹ...
Ngày tải lên: 10/06/2013, 01:27
Decolorization of Dye with Iron Oxide Catalysed Decomposition of Hydrogen Peroxide
... the expressions of ln ([H2O2]/[H2O2]0) as a function of the reaction time Good linear plot in Figure indicates that the H2O2 decomposition is the first order reaction with H2O2 This results agree ... Mechanism of FeOOH catalysed H2O2 decomposition and dye removal ≡Fe(II) reduced state H2O2 ⋅HO2/O2- H2O2 ⋅OH + Dye oxidized state ≡Fe(III) Surface Scavenging Products H2O2/HO2t-BuOH Surface Scavenged ... (mg/L) H2O2 Conc (mM) 20 15 10 80 60 40 20 0 10 15 time (hr) 10 mM mM no t-BuOH 20 25 10 15 20 25 time (hr) mM 0.1 mM 10 mM 0.1 mM Figure Effect of tert-butanol on H2O2 decomposition ([H2O2]0...
Ngày tải lên: 05/09/2013, 08:40
Characteristics of hydrogen production from food waste and waste activated sludge
... Each bottle was supplemented with 200 mg of KH2PO4, 14 mg of MgCl2•4H2O, mg of Na2MoO4•4H2O, mg of CaCl2•2H2O, 2.5 mg of MnCl2•6H2O, and 10 mg of FeCl2•4H2O, which was modified from Lay et al (1999) ... hydrogen production potentials were in the range of 10-70 mL H2/ g VS However, systematic studies of the anaerobic fermentation of solid wastes are still lacking, although hydrogen yield and hydrogen ... as hydrogen production ended up In most cases, nbutyrate was produced simultaneously with hydrogen production Simultaneous nbutyrate production with hydrogen was also reported in anaerobic hydrogen...
Ngày tải lên: 05/09/2013, 08:40
INFLUENCE OF NITROGEN, ACETATE AND PROPIONATE ON HYDROGEN PRODUCTION FROM PINEAPPLE WASTE EXTRACT BY Rhodospirillum rubrum
... (Hawkes et al., 2002) C6H12O6 C6H12O6 + 2H2O CH3CH2CH2COOH + 2CO2 + 2H2 ………………(4) 2CH3COOH + 2CO2 + 4H2 ……………… (5) Previous researchers demonstrated a successful hydrogen production from sucrose and ... the hydrogen produced in this study would not have resulted from the activity of nitrogenase but from hydrogenase This was because hydrogenase of photosynthetic bacteria is capable of both hydrogen ... that R rubrum contains distinct hydrogenase enzymes viz., (i) uptake hydrogenase which mediates hydrogen uptake during photoautotrophic growth; (ii) formate-linked hydrogenase which is synthesized...
Ngày tải lên: 05/09/2013, 09:08
Surface characteristics of acidogenic sludge in H2-producing process
... L-1): NH4HCO3 2025; K2HPO4.3H2O 800; CaCl2 50; MgCl2.6H2O 100; FeCl2 25; NaCl 10; CoCl2.6H2O 5; MnCl2.4H2O 5; AlCl3 2.5; (NH4)6Mo7O24 15; H3BO4 5; NiCl2.6H2O 5; CuCl2.5H2O 5; ZnCl2 Prior to operation, ... the hydrogentrophic methanogens and to enrich the H2- producing bacteria as described by Logan et al (2002) The image of the H2- producing sludge is shown in Fig Figure Image of the anaerobic H2- producing ... characteristics of H2- producing sludge might also be a significant factor affecting the fermentative H2 production However, little information concerning the surface characteristics of H2- producing...
Ngày tải lên: 05/09/2013, 09:08
Sustainability of an energy conversion system in Canada involving large-scale integrated hydrogen production using solid fuels
... The most advantageous alternative energy carrier is often predicted to be hydrogen, along with hydrogen- based fuels Hydrogen energy could find significant applications in the transportation sector ... resulting in the simultaneous production of several hydrogen streams (as shown in Figure 1) The hydrogen is derived in various stages from the hydrogen portion of hydrocarbons and by splitting ... converted to H2 and CO2 using steam Then, the hydrogen is separated from CO2 using membrane reactors [50] and sent for purification using the pressure swing adsorption (PSA) process The purified hydrogen...
Ngày tải lên: 05/09/2013, 14:58
Simultaneous hydrogen production and consumption in Anaerobic mixed culture fermentation
... 100; NaCl = 10; MgCl2· 6H2O = 10; CaCl2·2H2O = B) K2HPO4 = 300 C) MnSO4· H2O = 0.04; FeSO4 ·7H2O = 2.7; CuSO4· 5H2O = 0.055, NiCl2·6H2O = 0.1; ZnSO4·7H2O = 0.088; CoCl2· 6H2O = 0.05; H3BO3 = 0.05 ... Cytoplasm 2 NADH Formate (2) Fumarate (1 S 2) uccinate (1 4) H2 + CO2 FHL [NiFe]-H2ase Uptake [NiFe]-H2ases and Periplasm H2 + CO2 Q + 2H+ QH2 FRD H2 + 2H+ Figure Expected metabolic pathways in: (A) Anaerobic ... performance The overall hydrogen yield, YH2/G, during the first 20 days varied close to mol H2/ mol glucose consumed (Figure 3A) Low hydrogen yield, equivalent to 0.02 to 0.4 mol H2/ mol glucose, was...
Ngày tải lên: 05/09/2013, 14:58
Performance optimization of a PEM hydrogen-oxygen fuel cell
... reactions, respectively (cm/s) lower heating value of hydrogen (J/kg) mH2 mass transfer coefficients hydrogen mass flow rate (kg/s) MWH molecular mass of hydrogen (kg/mol) Pa , Pc total pressure of anode ... found as: W gross = I Vcell (18) The output current is correlated with the hydrogen mass flow rate by the equation [13]; mH2 = I MWH 2F (19) Thus, the thermodynamic efficiency of the fuel cell can ... determined as the ratio of output work rate W gross to the product of the hydrogen consumption rate m H and the lower heating value of hydrogen LHV H [13] W gross E fc = m H LHV H (17) Once the output...
Ngày tải lên: 05/09/2013, 14:58
Electric and hydrogen consumption analysis in plug-in road vehicles
... fraction of the hydrogen used is much smaller than that used in autonomy (Figure 8b) The more hydrogen is spent, like the energy consumption, the emissions will rise abruptly If hydrogen is obtained ... 2, 2010, pp.199-220 (a) 215 (c) (b) (e) (d) Vehicle A, H2 from Natural Gas Reforming Vehicle A, H2 from EU mix grid electricity Vehicle A, H2 from Wind power Vehicle B Vehicle C Vehicle D Vehicle ... Well-to-tank (Table 5) Table Gasoline, electricity and hydrogen s life cycle, well-to-tank, primary energy and CO2 emission factors[13] Hydrogen Gasoline Electricity NG Electrolysis Reforming...
Ngày tải lên: 05/09/2013, 14:58
Numerical simulation and performance test of metal hydride hydrogen storage system
... directing hydrogen can increase the penetration depth of hydride reaction and decrease the hydrogen absorption time Nomenclature Permeability of porous medium K Molecular weight M mass of hydrogen ... desorption in a metal hydrogen reactor”, Int J Hydrogen Energy, 1995, 20, 881-891 [11] D Mat, Y Kolpan, “Numerical study of hydrogen absorption in an Lm-Ni5 hydride reactor”, Int J Hydrogen Energy, ... analysis Parameter Molecular weight Heat of hydrogen reaction Specific heat Density Porosity Average diameter Effective thermal conductivity Convective heat transfer coefficient Hydrogen concentration...
Ngày tải lên: 05/09/2013, 14:58